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Use this option if you want to generate floating-point instructions that
will be compatible with version 9.0 or earlier of the compilers.  The macro
__SW_FPR will be predefined if "fpr" is selected.  For more information on
floating-point conventions see the sections entitled
16-bit:  Using the 80x87 to Pass Arguments: and
32-bit:  Using the 80x87 to Pass Arguments:.